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* The MIT License
* Copyright (c) 2003 Novell Inc.  www.novell.com
* 
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* furnished to do so, subject to the following conditions:
* 
* The above copyright notice and this permission notice shall be included in 
* all copies or substantial portions of the Software.
* 
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//
// Novell.Directory.Ldap.Extensions.PartitionEntryCountResponse.cs
//
// Author:
//   Sunil Kumar (Sunilk@novell.com)
//
// (C) 2003 Novell, Inc (http://www.novell.com)
//

using System.IO;
using Novell.Directory.Ldap.Asn1;
using Novell.Directory.Ldap.Rfc2251;

namespace Novell.Directory.Ldap.Extensions
{
    /// <summary>
    ///     Returns the number of entries in the partition.
    ///     An object in this class is generated from an ExtendedResponse object
    ///     using the ExtendedResponseFactory class.
    ///     The PartitionEntryCountResponse extension uses the following
    ///     OID:
    ///     2.16.840.1.113719.1.27.100.14
    /// </summary>
    public class PartitionEntryCountResponse : LdapExtendedResponse
    {
        /// <summary>
        ///     Returns the number of entries in the naming context.
        /// </summary>
        /// <returns>
        ///     The count of the number of objects returned.
        /// </returns>
        public virtual int Count
        {
            get { return count; }
        }

        //The count of the objects returned by the server is saved here
        private readonly int count;

        /// <summary>
        ///     Constructs an object from the responseValue which contains the
        ///     entry count.
        ///     The constructor parses the responseValue which has the following
        ///     format:
        ///     responseValue ::=
        ///     count  INTEGER
        /// </summary>
        /// <exception>
        ///     IOException  The response value could not be decoded.
        /// </exception>
        public PartitionEntryCountResponse(RfcLdapMessage rfcMessage) : base(rfcMessage)
        {
            if (ResultCode == LdapException.SUCCESS)
            {
                // parse the contents of the reply
                var returnedValue = Value;
                if (returnedValue == null)
                    throw new IOException("No returned value");

                // Create a decoder object
                var decoder = new LBERDecoder();
                if (decoder == null)
                    throw new IOException("Decoding error");

                var asn1_count = (Asn1Integer) decoder.decode(returnedValue);
                if (asn1_count == null)
                    throw new IOException("Decoding error");

                count = asn1_count.intValue();
            }
            else
            {
                count = -1;
            }
        }
    }
}